A short update. The little manuscript detailing the
evolution of Photosystem I and the implications for the evolution of oxygenic
photosynthesis is now available in the open access journal Heliyon, have a
look:
A press release accompanied the paper. Have a look too if
interested: https://bit.ly/2FZKXkA
The main conclusion of the paper is that the duplication
event that allowed Photosystem I to become a heterodimer occurred long before
the most recent common ancestor of cyanobacteria. It is has been hypothesized
that the reason why Photosystem I is a heterodimer in oxygenic photosynthesis
has to do with oxygen and avoiding reactive oxygen species. So, if the
duplication occurred after the evolution of water oxidation to oxygen it would
imply that the earliest stages in the evolution of oxygenic photosynthesis
appear much early than currently accepted.
The funny thing is that according to my plans, I was hoping
for the Photosystem II version of the manuscript to be published first, link
below. I have had to experience however everything that is horrible and
beautiful about peer-review, and everything in between, in the process. The
manuscript is still there fighting its way to freedom:
If you like the paper show your support by sharing the
preprint or leaving a comment!
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| Cyanobacteria doing photosynthesis |
